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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Alignment of Colloidal Rods in Crowded Environments.

Vincenzo Calabrese1, Stylianos Varchanis1, Simon J Haward1

  • 1Okinawa Institute of Science and Technology, Onna-son, Okinawa 904-0495, Japan.

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|July 18, 2022
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Summary

Polymer dynamics control colloidal rod alignment in solutions. The Weissenberg number predicts alignment, offering insights for designing anisotropic materials.

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Area of Science:

  • Colloid and Polymer Science
  • Rheology
  • Materials Science

Background:

  • Understanding colloidal rod alignment in polymer solutions is crucial for creating ordered materials.
  • The influence of polymer crowding on this alignment, especially at similar length scales, is not well understood.

Purpose of the Study:

  • To investigate how polymer crowding affects the flow-induced alignment of colloidal rods.
  • To compare this effect with crowding by additional colloidal rods in a pure solvent.

Main Methods:

  • Analysis of colloidal rod alignment in crowded polymer solutions.
  • Comparative study with colloidal rod crowding in a pure solvent.

Main Results:

  • Polymer dynamics, specifically the Weissenberg number, govern the onset of shear-induced alignment.
  • Colloidal alignment increases universally with shear rate, irrespective of the crowding environment.

Conclusions:

  • Colloidal rod alignment in polymer solutions can be predicted by the critical shear rate of polymer coil deformation.
  • This finding aids in the synthesis and design of anisotropic materials.